Why i am asking about this is because there is no one asking about it, so i'll try to ask about this civilization. Goguryeo is pretty strong civilization with potential to unite Korea but sadly they don't take it. If they are aware of this potential, here's my POD: Goguryeo, realizing it's potential, decides to invade and annex Silla after finding out that Silla declares independence. They quickly do that and it was a success, but pyrrhic. Then shortly afterward they turn north and annexes Buyeo, and they declare themselves as successor of Buyeo. But, Baekje tries to pride itself as a successor of Buyeo too. Aware of this, Goguryeo see their legitimacy challenged and in order to "prove" it, they invade Baekje with full force. Gaya, finding out that Baekje is in danger, tried to intervene on Baekje to "save" it. Goguryeo found out and as a result invaded both two. Both invasions was Goguryeo victory and finally united Korea, but with large loss of lives. Now, with that victory i expect Goguryeo to try expand to the North once more by taking on Manchuria and invading Dumakru on 510's, then finally by the mid-500's (on 540-560's) they finally annexed the last Korean kingdom independent from Goguryeo (Tamna, vassalized early 514), and solidified themselves as a major regional power competing with Yamato and maybe tries to gain foothold on China when there are any crisis from it. What are ramifications of that (like what happened to the East Asian culture), should all of it happens?
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